Method _new_mapper_instance

lib/sqlalchemy/orm/events.py:797–802

(
        cls,
        class_: Union[DeclarativeAttributeIntercept, DeclarativeMeta, type],
        mapper: Mapper[_O],
    )

    @classmethod
    def _new_mapper_instance(
        cls,
        class_: Union[DeclarativeAttributeIntercept, DeclarativeMeta, type],
        mapper: Mapper[_O],
    ) -> None:
        _MapperEventsHold.populate(class_, mapper)

    @classmethod
    @util.preload_module("sqlalchemy.orm")